/*4.1 按钮组
  Name:     mod_btn-group
  Example:
<div class="btn-group">
  <span class="btn btn-primary radius">左边按钮</span>
  <span class="btn btn-default radius">中间按钮</span>
  <span class="btn btn-default radius">中间按钮</span>
  <span class="btn btn-default radius">右边按钮</span>
</div>
  Explain:
*/
.btn-group {
  font-size: 0;
  .btn {
    margin-left: -1px;
  }
  .btn:not(:first-child):not(:last-child):not(.dropdown-toggle) {
    border-radius: 0;
  }
  >.btn:first-child:not(:last-child):not(.dropdown-toggle) {
    border-bottom-right-radius: 0;
    border-top-right-radius: 0;
  }
  >.btn:last-child:not(:first-child),
  >.dropdown-toggle:not(:first-child) {
    border-bottom-left-radius: 0;
    border-top-left-radius: 0;
  }
}
